1. Herbert, V., The Megaloblastic Anemias (Grune and Stratton, New York, 1959).
2. Beck, W. S., New Engl. J. Med., 266, 708 (1962).
3. Court Brown, W. M., Jacobs, P. A., and Doll, R., Lancet, i, 160 (1960).
4. Astaldi, G., Strosselli, E., and Airò, R., Boll. Soc. Ital. Biol. Sper., 38, 111 (1962).
5. Astaldi, G., Strosselli, E., and Airò, R., Boll. Soc. Ital., Biol. Sper., 38 114 (1962).